Diestock



I. w. NONNEMAN/ DIESTOCK. APPLICATION HLED JUNE 25. 1920.

Patented July 11, 1922.

2 SHEETS-SHEET I.

INVENTOR &% WWW/g,

BY 4 ZBWWM,

ATTORNEYS l. W. NONNEMAN.

DIESTOCK. APPLICATION FILED JUNE 25, 1920.

IRA W.NONNEMAN, OF WARREN, OHIO, ASSIGNOR TO THE BORDEN COMPANY, OF

WARREN, OHIO, A CORPORATION OF OHIO.

DIESTOCK.

Specification of Letters Patent.

Patented July 1 1, 1922.

Application filed June 25, 1920. Serial No. 391,716.

To all whom it may concern: Be it known that I, IRA W. NONNEMAN, acitizen of the United States, residing at Warren, in the county ofTrumbull and State of Ohio, have invented a certain new and usefulImprovement in Diestocks, of

I which the fOllOWiHg' is a full, clear, and

exact description, reference being had to the accompanying drawings. 7

This invention relates to die stocks and is particularly concerned withthat type having a plurality of sets of chasers so mounted that threadsof different pitches may be cut on pipes or similar articles ofdifferent diameters without removal or replacement of the chasers.

An object of this invention is to provide a simple and effective meansfor moving one set of chasers, having a given pitch, into an activeposition, and at the same time to move another set of chasers, having adifferent-pitch, into inactive position. Another object is to providefor positively locking the chasers in any selected position.

My invention will be hereinafter more fully described in connection withthe drawings and the essential characteristics are set forth in theclaims.

In the drawings Fig. 1 is a face or front viewof the die stock; Fig. 2is the same as Fig. 1 with the front plates removed showing the pivotedconnection between the chasers; Fig. 3 is an axial section through thedie stock; Fig. 4 is a section through the cam plate taken on the line44L in Fig. 5; Fig. 5 is a plan of the cam plate; Fig. 6 is aperspective of one of the Chasers; Fig. 7 is a detail showing theconnection of a rocking lever with one of the chasers.

Designating the-parts with the use ofreference characters in Fig. 3, 10represents the frame of the die stock, which has axially aligned innersleeves 11 and 12. The web 13 extends outwardly from the junction of theinner sleeves,,and carries, in addition to the flanges 14 and15,-diametrically opposite sockets 16 and 17, which are internallythreaded to receive stock handles 40 and 41.

Slidably mounted within the frame 10 are one set of chasers 18 andanother set of chasers 19. These chasers are positioned on the forwardend of the frame and may extend through notchesin the flanges 12 and 15;the-notches having a width substantially equal to the thickness of twoof the chasers,

and a depth substantially equal to the width of one of the chasers.

A cam plate 25 rotatably positioned on the sleeve 12 fits against theflange 15. This cam plate is substantially a ring disk having connectedarcuate cam grooves cut on the inner face. These grooves as shown inFig. 5 comprise chaser moving or active grooves 45, for adjustment, andrest grooves 46, connected by transfer grooves 17 which serve to reversethe positions of chasers. The depth of the grooves may be substantiallyequal to half the thickness of the cam plate, it being only necessary toprovide depth suflicient to give good hearing to the pins 20 which movetherein. A tongue 27 protrudes from the cam plate 25 and serves toprovide means by which the operator can rotate the cam plate. 7 i

As shown in Fig. 2 a rocking lever 30 pivoted on a rock shaft or pin 31may be bent inwardly at each end and slidably secured at one end to oneof the chasers in the set 18, the other end being slidably secured to achaser of the set 19. The rocking lever may comprise a strip of wirebent to form a loop at its middle portion throu h which the pin 31 maybe inserted, while the outer end may be bent towards the axis of the diestock to permit the ends to engage notches 22 in the chasers.

The pins 31 together with the rocking levers 30 are secured to the frame10, in the annular portion 23. In this location any movement of therocking lever will not interfere with any movement of the cam plate 25.To secure the cam plate, after the proper adjustment has been made, byrotating it to the desired position, I may provide a clamping nut28which has an internal thread adapted to engage a threaded portion ofthe sleeve 12.

As a convenient means for guiding the die stock when a thread is beingcut on a pipe or other article, I provide guide jaws 35 slidably mountedin notches with flanges 11 and 14:, and provide a cam plate36 which uponrotation will move the guide bars in wardly 0r outwardly. I may alsoprovide a lock nut 37 to clamp the cam plate 36 when the properadjustment of the slide jaws 35 has been effected.

In operation, the stock frame is inserts over theend of the pipe orother article to be threaded, the slide jaws adjusted to the outsidediameter of the pipe andlocked in this position. The chasers having theposi tion desiredon the forward end of the die are then moved eitherinwardly or outwardly by rotation of the cam plate 25. The movement ofthe chasers is caused by the pin 20 moving in the curved grooves l5 andL6. The pins 20 of the chasers which are in use will occupy the camgrooves i5 and their location in the grooves will be determined by thesize of the work being operated on. The chasers which are inoperativewill have their pins 20 in the rest groove 46. hen a chaser moves froman active to a rest position, the pin moves along the slot and (as bestseen in Fig. 5) toward the center of the cam plate until it reaches theoutwardly curved portion of the cam whereupon it moves away from thecenter and towards the rest groove.

The neutral point where the rest and active grooves merge is indicatedat 4?, and as the pins 20 pass these neutral points the members 30,operated by the pins in the othergrooves, will cause the first mentionedpins to properly enter the rest slot 46 so that there can be no jammingaction, due to the tendency of the pins to enter the next active groove45 instead of the rest groove 46. The lever members 30 being made ofwire are somewhat resilient or yielding in their action and this causesthe pins to enter their ple, durable and capable of being cheaplymanufactured;

Having thus described my invention, what I claim is 1. In a die stock,the combination with a.

proper grooves, even although the latter are I worn orsomewhatinaccurate. After they have been moved so that they will conformto the size of the pipe to be threaded, then the lock nut 28 is drawn upthus clamping the cam plate against the'flange 15 of the frame. Duringthe cutting operation the ehasers 0f the active setare positively lockedagainst outward movement by the walls of the grooves 45, bearing againstthe pins 20.

To effect an inward or outward movement of the chasers, it is necessaryto slacken the nut 28 and to rotate the cam plate 25. The grooves in thecam plate are so designed that 'an inward movement of the set of ehasers19- eitects an outward movement of the chasers in the set 18, as soon asthe pins in the chaser enter the transfer grooves 47. The rocking leverswhich connect the adj a cent chasers serve to effect a positive movement of one of the chasers with relation to the adjacent one, and at thesame time to prevent any binding action which may occur between the pinand the walls oi the groove in the cam plate.

It will thus be seen that I have provided a die stock capable ofcarrying chasers having'ditterent positions and, at the same time that Ihave provided means for moving one set ot-chasers relative to the otherset. My invention possesses the advantage of positively locking thechasers in any selected position. Further it provides a die stock whichis simetlects a relative movement of the chaser carrying frame, aplurality of sets otradially movable chasers,- a cam for simultaneouslyactuating all sets of chasers, and lever connections extending from achaser of one set to a chaser of another set.

2. In a die stock, the combination with a chaser carrying trams, aplurality of sets of radially movable chasers, means for actuatingeither set of chasers relative to the other, and lever connections eachextending from a chaser of one set to a chaser of an other set.

In a die stock, the combination of a chaser carrier, a cam plate havingtwo sets of cam grooves therein and rotatably mounted on the carrier, aplurality of sets of chasers movable in said carrier, one set of camsbeing adapted to move one set of chasers into active position, while theother set ism-oving the otherset of chasers into an inactive position,and lever connections between one set of chasers and another.

4. A cam plate for use in a die stock, comprising a ring disc havingconnected arcuate grooves therein, said-grooves comprising a continuoussubstantially circular outer rest groove and a set of inner connectedarcuate active grooves, said inner grooves having -a plurality of pointscommon with the outer groove.

5. In a die stock, the combination of a chaser carrier, a cam platerotatably mounted thereon, a plurality of sets of chasers movable insaid carrier, said cam plate having active, rest, and intersectingtransfer grooves, means connecting the chasers with the said cam wherebymovement of the cam said chasers.

6. In a die stock, the combination of a chaser carrying frame, twosetsof chasers radially movable in said frame and arranged in pairscomprising a chaser of each set, a cam plate having endless cams adaptedto coact with said chasers and to cause relative movement of one set ofchasers with another set of chasers, aivoted connections between chasersof one set and those of the other set.

"7. In a die stock, the combination with a chaser carrying frame of aplurality of chasers arranged in sets, a cam'plate having groovestherein, a lever pivoted. at the cen ter, and connecting at its ends achaser of one set with a chaser of another set, means on said chaseradapted to engage the grooves in said cam plate, one of said groovesbeing annular and another of said grooves com prising a series ofconnected arcuate grooves.

8. In a die stock, the combination with a chaser carrying frame of aplurality of chasers arranged in sets, a lever pivotally mounted withinsaid frame and connecting a chaser of one set with a chaser of anotherset, a cam plate having grooves therein comprising active, rest, andtransfer grooves, and means on said chasers for engaging the said,grooves.

9. In a die stock, the combination with a chaser carrying frame of twosets of chasers arranged in pairs,'each pair comprising a chaser of eachset, a lever intermediately pivoted and having its ends secured to onechaser of each set, whereby movement of a chaser in one set causes arelative movement of a chaser in another set.

10. In a die stock, the combination with a frame, of a cam plate mountedthereon and having grooves therein, chasers mounted in said frame,projecting members on said chasers for engaging the grooves in said camplate, said grooves comprising a set of active grooves and a set of restgrooves, one

' of said sets surrounding the other, and the two sets being connectedat spaced points by transfer grooves.

11. In a die stock, the combination with a frame, of a cam plate, havingactive, rest, and transfer grooves therein and rotatably mounted in theframe, means on the chasers adapted to engage the said grooves, meanspivotally mounted on the frame and engaging a pair of adjacent chasers,to shift the chasers from one type of groove to another.

12. In a die stock, the combination with frame, a plurality of sets ofchasers, a cam plate having rest, active and transfer grooves, said restandactive grooves occupying the same circumferential space through aportion of their extent and being connected by said transfer grooves,means on the chasers for en 'a in the said 'rooves b b b 1:

whereby relative movement is obtained be tween the adjacent members ofsaid sets of chasers, and means connecting a chaser of one set with achaser of another set.

13. In a die stock, the combinationwith a frame of a cam plate havinggrooves therein and rotatably mounted in the frame, means on the chasersadapted to engage the said grooves, a lever pivotally mounted on theframe and engaging a pair of adjacent chasers.

14. In a die stock, the combination with a frame, a plurality of sets ofchasers, a cam plate having rest'and active grooves, said active groovesbeing spaced radially inwardly of said rest, grooves, and transfergrooves constituting a connection between the other grooves.

15. In a die stock, a chaser carrying frame, sets of chasers arrangedtogether in pairs and adapted to be moved toward and from the work, acam groove, means adapted to enter the cam groove to move the chasers,and a pivoted lever connecting the adjoining chasers in pairs.

16. In a die stock, the combination of a chaser carrier, a cam platerotatably mount- I means coacting with said cam groove, whereby as onechaser of each pair moves towards the work the other moves away, and ayielding lever connecting the adjacent chasers of different sets,whereby during operation said lever will give to prevent any jammingaction between the chasermoving means and the cam groove.

18. In a die stock, a chaser carrying frame, two sets of chasersarranged together in pairs and adapted to be moved toward and from thework, a cam groove, means on said chasers adapted to coact with said camgroove to move the chasers toward and from the work, a wire rodconnecting the adjacent chasers of different sets and acting to preventany binding action which might occur between the cam groove'and thechaser moving means which coact with the groove.

19, In a die stock, the combination with a frame of two sets of chasers,a cam plate rotatably mounted thereon, said cam plates having sets ofactive and rest grooves, pro jecting members on one set of chasers forengaging an active groove and projecting members on the other set ofchasers for engaging the rest grooves, and a lever having its endsslidably mounted in a chaser of each set, whereby the chasers of one setare moved to an active groove when the chasers of the other set aremoved to the rest groove.

In testimony whereof, I hereunto afiix my signature.

IRA W. NONNEMAN.

